I'm having the same problem - new roesttes blooming. I've not done surgery as I have at least one other Hester, and I'm not sure yet if all the newbies are going to bloom. I tried simple decapitation with my silverline and all I got were blooms. I decapitated and then quartered another semp and that resulted in some flowers and one new rosette, saving what was my only one of that type.
I like the new tagging thingie by the way, but I wasn't alerted to the post, or at least if I was I must have missed it?